190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC Page 33-102
2. Use the FMS Joystick to select the desired configurable item and make the desired change. Then
press the ENT Key or use the FMS Joystick to select the next item. Press the FMS Joystick to
move the cursor to the page selection menu when finished.
3. Press the Options softkey to switch between the Display Configuration Page and the Backlight
Configuration Page. Each of these pages are detailed in the following sections.
33.4.12.1 Display Configuration Page
Display Backlight Configuration Window:
Backlight Intensity: Can be set to Auto or Manual (this setting is also available in normal mode on the
Display Setup page).
Auto–Sets the backlight intensity (display brightness) based on the aircraft’s instrument lighting bus
voltage.
Manual–Allows setting the display brightness by changing the Backlight Intensity (0-9) setting found
beside the ‘Manual’ setting.
Default Mode: Can be set to Auto or Manual (described above). This controls the backlight mode that
will be active each time the system is powered on.
Automatic Backlight Control Window (settings apply only to ‘Auto’ setting):
Input Voltage–Displays the current lighting bus voltage
Backlight Level–Displays the current backlight level (0-100%)
Graph–Brightness is displayed as the vertical (Y) axis, and aircraft lighting bus voltage is displayed as the
horizontal (X) axis. The graph changes according to the auto backlight control settings, and the lighting
bus voltage.
Off Threshold–Sets the lighting bus threshold voltage. At the threshold voltage, the backlighting is turned
on per the Min Brightness setting. Below the threshold voltage, the backlighting defaults to a Backlight
Level of 100% . The ’±’ setting controls the range that the Off Threshold voltage is in effect. Default
values are 2.9 V & ±0.15 V. If the Off Threshold value is set to 0.0 V, it will be be ignored, and the display
brightness will remain at the Min Brightness level for any voltage between zero volts and the Min
Brightness voltage setting.
Min Brightness (Voltage and Percentage)–Sets the lower bus voltage required to turn the backlighting
on to the percentage of brightness set by the Min % setting. Default values are 3. 0 V and 10%.
Max Brightness (Voltage and Percentage)–Sets the upper bus voltage required to turn the backlighting
on to the percentage of brightness set by the Max % setting. Default values are 12.0 V and 100%.
Input Type–Sets the aircraft lighting bus voltage for either 12 or 24 V input to match the aircraft lighting
bus voltage.
Time Constant–Adjusts the speed (in seconds), that the brightness level responds to changes in the input
voltage level.
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